Low noise amplifier (T466E)

Found in 1948 MIT documentation, this 4-tube amplifier is characterized by its low noise level.

ST Microelectronics STSPIN32F060x Three Phase 600V Controller
ST Microelectronics STSPIN32F060x Three Phase 600V Controller This STMicroelectronics component...
Zero Crossing Detector (CB10521E)
This zero-crossing detector circuit produces an output pulse every time the input sinusoidal...
Programmable Gain Amplifier (CB13915E)
This circuit is from American documentation from 1970. It can be designed with a BC558 and for the...